The 81-year-old Waldo-Hancock Bridge over the Penobscot River that connects Verona Island and Prospect in Maine is undergoing a complicated demolition process. Explosives can't be used and 20-foot tides mean that the bridge deck can be anywhere from 125 feet to 145 feet above the river. The bridge will be dismantled in reverse order from how it was built, said Douglas Coombs, project manager for the state Department of Transportation. "There’s a very elaborate plan of how to do this, and the sequence of how it's done, so that we don’t overload the existing towers in any way," said Coombs.

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